Posted by **Anonymous** on Friday, October 2, 2009 at 11:03pm.

A house painter uses a chair and pulley arrangement to lift himself up the side of a house. The painter's mass is 69.2 kg and the chair's mass is 24.0 kg. With what force must he pull down on the rope in order to accelerate upward at 0.379 m/s2?

The rope that the painter pulls down on goes through a pulley and is attached the chair he is sitting on.

- PHYSICS - plz help -
**drwls**, Friday, October 2, 2009 at 11:11pm
The force F that the painter applies to the rope is doubled by the pulley so that 2F is what accelerates the painter and chair.

Solve the equation 2F = m a, where m is the total mass (69.2 + 24.0 kg). a is the acceleration, 0.379 m/s^2

The quantity you want is F

- PHYSICS - plz help -
**Anonymous**, Friday, October 2, 2009 at 11:39pm
I got 17.7 N as my answer, but it was incorrect. I'm not sure why.

- PHYSICS - plz help -
**Michael**, Friday, October 28, 2011 at 12:21am
Since your trying to accelerate up you have to remember that g = -9.8. So to accelerate up you need to add 9.8 + .379, in order to find the acceleration. So it would be m = 93.2 and a = 10.179. Then solve for 2F = m*a. Answer is 474.34 N

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